Water soluble entrapping of a pesticide

ABSTRACT

Materials are entrapped in water soluble hydroxyalkyl acrylate or methacrylate polymers to provide ready sources of the material by the deletion of water. Thus, there can be entrapped drugs, pesticides, flavoring agents and fragrances.

- United States Patent [151 3,660,071

Gould et al. [45 Ma 2, 1972 [54] WATER SOLUBLE ENTRAPPING OF A 51 Int. Cl ..A0ln 17/00, A6lk 9/00 PESTICIDE [58 Field or Search ..71/65, 79, D16. 1; 424/81 [72] Inventors: Francis E. Gould, Princeton; Thomas H. 5 References Cited Shepherd, Hopewell, both of NJ. [73] Assignee: National Patent Development Corporation, UNITED STATES PATENTS New York, N.Y. 3,576,760 4/1971 Gould et al. ..252/403 Filed: Sept- 1970 3,220,960 11/1965 wlchterle et al. ..260/2.5

[2]] Appl. No.: 70,940 Primary Examiner-Shep K. Rose Attorney-Cushman, Darby & Cushman Related US. Application Data [60] Division of Ser. NO. 833,182, June 13, 1969, Pat. No. [57] ABSTRACT and a continuation-impart of Materials are entrapped in water soluble hydroxyalkyl acryd l 26, 1966, 3,520,949, and a late or methacrylate polymers to provide ready sources of the commuanon'm'pan of N 2 June material by the deletion of water. Thus, there can be en- 1967, abandoned, and a contlnuatlon-m-part of trapped drugs, pesticides, flavoring agents and fragrances. NO. 654,044, July 5, I967.

52 us. c1. ..7l/65,7l/79,7l/DIG. 1,

9 Claims, No Drawings Linear hydroxyalkyl acrylate and methacrylate solublein solvents other than water are disclosed in our copending application Ser. No. 654,044, filed July 5, 1967. These polymers, however, are not soluble in water as the sole solvent.

Frequently it is desirable, however, to entrap materials in a water soluble polymer. Thus, the advantages of awater soluble polymer become apparent in certain uses, e.g., in the entrapment of flavors, perfumes, etc. wherein the polymer carrying the entrapped material is added to water, as for example in a soft drink or in adetergent composition. In these cases it is desirable to have the polymer dissolve to avoid the presence of suspended granules which can detract from the appearance in a drink or leave a dusty residue on clothing, dishes, etc. in the case of a detergent.

The water soluble polymers also are advantageous -in trapping certain species such as enzymes which will not tolerate alcohol or solvents other than water.

it is an object of the present invention to prepare novel compositions containing materials entrapped in a water soluble polymer.

Another object is to protect materials from attack by atmospheric oxygen.

A further object is to devise ameans for contacting nonwater soluble materials with an aqueous environment.

Still further objects and the entire scope of applicability of the present invention will become apparent from the detailed description given hereinafter; it should be understood, however, that the detailed description and specific example, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention -will become apparent to those skilled in the art from this detailed description.

It has now been found that these objects can be attained by employing water soluble hydrophilic polymers of hydroxyalkyl acrylates and methacrylates as entrapping agents. Thus there are employed copolymcrs of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate or'hydroxypropyl methacrylate with 0.5 to percent of a water solubilizing copolymerizable monomer. The copolymerizable monomer should be present in amount sufficient to be surethatthe polymer is completely soluble in water. Of course, mixtures of hydroxyalkyl acrylates and methacrylates can'be employed. Thus, while the hydroxyalkyl methacrylate esters are preferred as starting material up to about 40 percent by weight of hydroxyalkyl acrylate can be used in'the hydroxyalkyl methacrylate containing mixture of monomers.

The polymers employed in the present invention being water soluble distinguish not only from those in our prior ap-' plication but also distinguish from the cross linked hydroxyalkyl methacrylate polymers and the like shown in Wichterle US. Pat. No. 3,220,960 for example, since the Wichterle polymers is not soluble in any solvent, but only swellable. The polymers employed in the present invention are not only soluble'in water but are alsosoluble in many polar solvents.

The polymers employed in the present invention have the advantage over conventional water soluble polymers such as polyethylene oxides, polyvinyl alcohol, cellulose ethers, etc. in the barrier properties of the dry polymer. The polymers of the present invention give superior protection to entrapped species from atmospheric oxygen and are superior in preventing diffusion and loss ofthe entrapped species.

The solubilizing comonomer in polymerizing the hydroxyalkyl acrylate or methacrylate can be either (1) an ammonium or alkalimetal -(e.g., sodium or potassium) salt of a polymerizable-ethylenically unsaturated (or nonbenzenoid unsaturated) organic acid or 2) a strong acid salt of a polymerizable ethylenically unsaturated (or nonbenzenoid unsaturated) amlno containing monomer.

Examples of organic acids for making the ammonium and alkali metal salts include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, aconitic acid, cinnamic acid, crotonic acid, cyclohexene, carboxylic acid, propiolic acid, mesaconic acid, citraconic acid, vinyl sulfonic acid, p-vinylbenz'enesulfonic acid, partial esters such as mono 2-hydroxyethyl'citraconate, mono 2-hydroxypropylitaconate, mono 2- hydroxyethyl itaconate, mono 2-hydroxypropyl citraconate,

mono -2-hydroxyethyl maleate, mono 2-hydroxypropyl fumarate, mono methyl itaconate, monoethyl itaconate, mono Methyl cellosolve itaconate (Methyl cellosolve is the 'monom'ethyl'ether of diethylene glycol), mono Methyl cellosolve maleate, mono-2-hydroxyethyl aconitate.

Examples of strong acid salts of polymerizable amino containing monomers are the hydrochloric, hydrobromic, sulfuric -acid, nitric acid, phosphonic-acid, benzene sulfonic acid,

' methacrylate,

naphthalene sulfonic acid, trichloroacetic acid, and p-toluene sulfonic acid salts of diethylaminoethyl methacrylate, dimethyl aminoethyl methacrylate, monomethylaminoethyl t-butylaminoethyl methacrylate, paminostyrene, o-aminostyrene, 2-amino-4-vinyltoluene, diethylaminoethyl acrylate, dimethylaminoethyl acrylate, tbutylaminoethyl acrylate, piperidinoethyl acrylate, piperidinoethyl methacrylate, morpholinoethyl acrylate, morpholinoethyl methacrylate, 2-vinyl pyridine, 3-vinyl pyridine, 4-vinyl pyridine, 2-ethyl-5-vinyl pyridine, dimethylaminopropyl acrylate, dimethylamino propyl methacrylate, dipropylaminoethyl acrylate, dimethylaminoethyl vinyl ether, dimethylaminoethyl vinyl sulfide, diethylaminoethyl vinyl ether, aminoethyl vinyl ether, 2- pyrrolidinoethyl methacrylate, 3-(dimethylaminoethyl)-2- hydroxypropyl acrylate, 3-(dimethylaminoethyl)-2-hydroxypropyl methacrylate, Z-aminoethyl acrylate, 2-aminoethyl methacrylate. The alkylaminoethyl 'acrylates and methacrylates are preferred in group (2).

-Aportion (up to'40 percent of total monomers) of the hydroalkyl acrylate or'methacrylatecan be replaced by acrylamide, methacrylamiden-isopropyl methacrylamide, n-

methylacrylamide, n-methyl methacrylamide, n-l2-hydroxyethyl, acrylamide, n-( 2-hydroxyethyl methacrylamide When materials which are not water soluble are desired to ethanol, isopropanol, n-propanol, methyl cellosolve (monomethyl ether of diethylene glycol), ethyl cellosolve, monoethyl ether of diethylene glycol, dioxene-water mixtures, pyridine, dimethyl formamide, dimethyl sulfoxide, tetrahydrofurfuryl alcohol and mixtures of any of the abovementioned'solvents with each other or water.

On contact of such water insolubleentrapped materials with water, the polymer dissolves, leaving the entrapped species exposed and in contact with the aqueous environment. This can be taken advantage of in applying pesticides to the soil. For example, the entrapped pesticide can be applied in the dry form to the top of the soil or it can be embedded in the soil and will be released as a result of rain or artificial watering.

Usually 0.1 to 35 percent of the entrapped material is employed based on the weight of the polymer.

The water soluble polymers of the present invention are infinitely soluble in water, although at concentrations above 30 percent solution viscosity rises sharply.

Solubility of the polymers is pH dependent. For example, polymers containing salts of carboxylic or sulfonic acids as part of the structure will not be soluble at a pl-i'below about 3.5 and polymers containing amine salts as part of the structure will not be soluble at a pH above about 8.5.

Thus, for release of fragrance in common alkaline detergents, e.g., soap, sodium decylbenzene sulfonate, sodium lauryl sulfate, sodium dodecylbenzene sulfonate, sodium propyl naphthalene sulfonate, sodium di(2-ethylhexyl) sulfosuccinate, sodium alkyl benzene sulfonates having 14 to 18 carbon atoms in the alkyl group or the like (i.e., anonic'detergents) polymers containing carboxylate salt groups are primarily useful whereas for cationic detergents, e.g,, trimethylbenzylammonium chloride, l-lauryl-3-ethylbenzotriazolium bromide, trimethyl stearamidoethyl ammonium sulfate and lauryl trimethyl ammonium chloride. Those olymers containing amine salt groups are preferable. Either type of polymer can be used with equal facility with non ionic detergents such as p-isooactylphenol condensed with ethylene oxide units, polyoxyethylene sorbitane monoleate, tertiary dodecyl polyethylene glycol thioether, tri(polyoxyethylene sorbitan monopalmitate), Spans, Tweens, etc., providing there is not present another ingredient which causes a substantial pH shift away from percent.

Any common fragrance or food flavor can be entrapped, e.g., orange oil, citral, coffee, tea, lemon oil, synthetic lemonlime flavor, strawberry flavor, vanilla, biacetyl, anise, lilac fragrance, pine fragrance, peppermint oil, oil of orchids essence, anethole, ethyl propionate, ethyl acetate, acetaldehyde, menthol and Spearmint.

In addition to fragrances and food flavors, there can be entrapped in the water soluble polymers pesticides including bactericides, fungicides, insecticides and nematocides, enzymes-and drugs.

Examples of bactericides include trimethyl benzyl ammonium chloride, cetyl pyridinium chloride, hexachlorophene, streptomycin, salicylic acid, penicillin, aureomycin, chloromycetin, merthiolate, sulfanilamide, sulfathiazole, fungicides including methyl-l-( butylcarbamoyl)-2-benzimidazole carbamate, N-trichloromethylthio-4-cyclohexene 1,2-dicarboximide, methyl mercury 2,3-dihydroxypropyl mercaptide, methyl mercury acetate, N-(ethylmercury)-p-toluenesulfonanilide, chloranil, l,4-dichloro-2,S-dimethoxybenzene, copper carbonate, copper oleate, basic cupric chloride, cuprous oxides 3-[ 2-( 3 ,5 dimethyl-2-oxocyclohexyl)-2- hydroxyethyl]glutarimide, 2,4,5,6- tetrachloroisophthalonitrile, tetrahydro-3 ,S-dimethyl-ZH- l,3,5-thiadiazine--2-thione, 2,6-dichloro-4-nitroaniline, pdimethylaminobenzenediazo sodium sulfonate, bis(n-propylsulfonyl) ethylene (3-1843), 2,3-dichloro-l,4-napthoquinone, cis-N-[( l,l ,2,2-tetrachloroethyl)thio]-4-cyclohexenel,2-dicarboximide, coordination product of zinc and manganese ethylene bisdithiocarbamate (Dithane M-45 mixture of nickel sulfate and manganous ethylene bis [dithiocarbamate] (Dithane 5-31), dodecylguanidine acetate, 2,4- dichloro-6-(o-chloroanilino)-s-triazine, sodium ethyl-mercurithiosalicylate,3,4,5,6,7,7-hexachloro-N-(ethyl mercuri)- l ,2,3 ,6-tetrahydro-3 ,6-endo-methanophthalimide, ferric dimethyl dithiocarbamate, N-(trichloro-methylthio) phthalimide, Z-heptadecyl-imidazoline acetate, Griseofulvin, hexachlorobenzene, l-chloro-2-nitropropane, manganous ethylene bis carbamate, 3,4,5,6,7,7-hexachloro-N-(methylmercuri l ,2 ,3 ,6-tetrahydro-3 ,6-endo-methanophthalimide, mercuric chloride, sodium methyldithiocarbamate, 6-methyl- 2,3-quinoxalinedithiol cyclic-S,S-dithiocarbonate (also mites) disodium ethylenebisdithiocarbamate, manganese dimethyl dithiocarbamate and mercaptobenzothiazole mixture (Niacide), methyl mercury 8-hydroxyquinoline, 2-phenylphenol, methyl mercury dicyandiamide, phenylmercuritriethanolammonium lactate, pentachloronitro-benzene, phenyl-mercury urea, 3-(2l-methyl-piperidino) propyl 3,4-dichlorobenzoate, 2,3-dihydro-5 -carboxanilido-6-methyll ,4-oxathiin-4,-dioxide, phenylmercuric acetate, Polyram, 8-hydroxyquinoline sulfate, hydroxymercuri-nitrophenol and hydroxymercurichlorophenol mixture, sulfur, 5-ethoxy-3-trichloromethyl- 1,2,4-thiadiazole, l,2,4,5-tetrachloro-S-nitrobenzene, bis (dimethylthiocarbamoyl) disulfide, 3,5,6-trichloro-o-anisic acid, triphenyltin hydroxide, 2,B-dihydro-5'carboxanilido-6-' methyl-1,4-oxathiin, zinc ethylene bisdithiocarbamate, zinc dimethyl dithiocarbamate and lauryl isoquinolium bromide. Insecticides (or miticides) including, 0,0,0',O'-tetramethyl 0,0-thiodi-p-phenylene phosphorothioate, isopropyl 4,4- dic'hloro-benzilate, O-[2-chloro l-(2,5-dichlorophenyl)-vinyl] 0,0-diethyl phosphorothioate, aldrin, allethrin, 0,0,0,0- tetrapropyl dithiopyrophosphate, 0,0-diethyl-s-[4-oxol ,2,3- benzotriazin-3(4H)-ylmethyl]-phosphorodithioate, 0,0- dimethyl-s-[4-oxol ,2,3-benzotriazin-3( 4H )-ylmethyl phosphorodithioate, dimethyl phosphate of 3-hydroxy-N- methyl-cis-crotonamide,2-isopropoxyphenyl N-methyl carbamate, benzene hexachloride (BHC), dimethyl phosphate of 3- hydroxy-N,N-dimethyl-cis-crotonamide,2-sec-butyl-4,6- dinitrophenyl-3-methyl-2-butenoate, dimethyl 3-hydroxyglutaconate dimethyl phosphate, dimethyl (2,2,2-trichloro-lhydroxyethyl) phosphorate ester of butyric acid,m-( l-methylbutyl) phenylmethyl carbamate, m(1-ethylpropyl) phenyl methyl carbamate, calcium cyanide, l-naphthyl N-methylcarbamate, 2,3-dihydro-2,2-dimethyl-7-benzofuranyl methyl carbamate, 'S-[(p-chlorophenylthio) methyl]0,0-diethyl phosphorodithioate, m[[(dimethylamino)methylene]-amino] phenyl methylcarbamate hydrochloride, chlordane, ethyl 4,4- dichlorobenzilate, N,N-dimethyl-N'-( 2-methyl-4-chlorophenyl)-formamidine, dimethyl phosphate of a -methylbenzyl 3- hydroxy-cis crotonate,0,0-diethyl-O-3-chloro-4-methyl-2- oxo-2H-l-benzopyran-7-ryl-phosphorothioate,cyclic ethylene (diethoxyphosphinyl) dithiomido carbonate, l,l-dichloro-2,2- bis(p-chlrophenyl) ethane, DDT (1,1,l-trichloro- 2,2-bis (pchlorophenyl)ethane, Demeton (mixture of 0,0-diethyl-O- [2-(ethylthio)ethyl] phosphorothioate and 0,0-diethyl-S-[2- (ethylthio )ethyl ]phosphorothioate ),0,0-dimethyl-O- (2,2dichlorovinyl phosphate (DDVP), 0,0-diethyl O-(2- isopropyl-(o-methyl-4-pyrimidyl) phosphorothioate, O-2 chloro-4-nitrophenyl 0,0-diethyl phosphorothioate, Dieldrin, 2-nitro-l,l-bis(p-chlorophenyl) butane, 2-nitro-l,l-bis-(pchlorophenyl) propane, tetramethyl phosphorodiamidic fluoride, 2,4-dimethyl-benzyl 2,2-dimethyl-3-(2-methyl propenyl) cyclopropanecarboxylate, 4,4-dichloro-a-methylbenzhydrol (primarily an acarcicide and miticide), 4,6- dinitro-o-cyclohexylphenol, 2-sec-butyl-4,6-dinitrophenyl isopropyl carbonate (miticide), 2,3-p-dioxanedithiol-S,S- bis(0,0-diethyl phosphoro-dithioate), diphenylamino, 0,0- diethyl-S-[ 2-( ethylthio )-ethyl ]phosphorodithioate, 0,0- diethyl-O-(3,5,6-trichloro-2-pyridyl) phosphorothioate, O- ethyl-Sphenyl-ethylphosphonodithioate 6,7 ,8 ,9, l 0, l O-hexachlorol ,5 ,5a,6,9,9a-hexahydro-6,9-methano-2,4,3- benzodioxathiepin-B-oxide,Endrin, O-ethyl-O-p-nitrophenyl phenyl-phosphonothioate, 2,3-quinoxaline-dithiol cyclic trithiocarbamate v(ovicide for spider mites), 0,0,0,O'- tetraethyl S,S'-methylene biophosphorodithioate (mites), 0,0-dimethyl-O-[4-methylthio)-m-tolyl]-phosphorothioate, 2-chloro-l-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate, 2,4-dichlorophenyl ester of benzene sulfonic acid, Heptachlor, hydroxymercurichlorophenol,N-(mercaptomethyl) phthalimide S-(0,0-dimethyl phosphorodithioate), 2-(1- methylheptyl) 4,6-dinitrophenyl crotonate, decachlorooctahydro-l ,3,4-metheno-2H-cyclobuta[ cd] pentalen-Z- one,2,3,S-trimethylphenyl carbamate,3,4,5-trimethyl-phenyl carbamate, dibasic lead arsenate, B-butoxy-fi'-thiocyanodiethyl ether, 1,2,3 ,4,5,fi-hexachlorocyclohexane gamma isomers 5,6-dichloro-2-trifluoromethylbenzimidazolel-carboxylate (mites), 0,0-dimethyl phosphoro-dithioate of diethyl mercaptosuccinate, 4-(dimethylamino)-m-tolyl methylcarbamate, methyl-carbamoylmethyl) phosphorothiolothionate, S-(4,6- diamino-s-trizin-2-ylmethyl) 0,0-dimethyl phosphorodithioate, 4-(methylthio)-3,S-tylylmethylcarbamate, S-methyl-N-[(methylcarbamoyl)-oxy] thioacetamidate, 2,2-bis( p-methoxyphenyll l 1 -trichloroethane (Methoxychlor), bromomethane, o-[2-(Ethylthio)ethyl] 0,0-dimethyl phosphorothioate (Meta Systox), 0,0-dimethyl-O-pnitrophenyl phosphorothioate,S-[ [(p-chlorophenyl)thio] methyl] 0,0-dimethyl phosphorodithioate, 3-(p-bromophen- 0,0-diethyl-S-(N-ethoxycarbonyl-N- yl l -methoxyl-methylurea, 2-carbamethoxyl -methylvinyl dimethyl phosphate (a isomer, 4-benzothienyl-N-methyl carbamate, O,S-dimethyl phosphoramidi-thioate, 1,2-dibromo- 2,2-dichloroethyl dimethyl phosphate, naphthalene, 2,2- dimethyl-3-(2-methylpropenyl) cyclopropanecarboxylic ester of N-( hydroxymethyl)- l -cyclohexene-l ,2-dicarboxymide, nicotine (3-( l-methyl 2-pyrrolidyl)pyridine),odichlorobenzine, p-chlorophenyl-p-chlorobenzenesulfonate (mites), p-dichlorobenzene, 0,0-diethyl-O-p-nitro-phenyl phosphorothioate (Parathion), copper meta-arsenite copper acetate cmoplex (Paris green), decachlorobis(2,4-cyclopentadienel -yl) (mites), l ,1-dichloro-2,2-bis(p-ethylphenyl)ethane, dibenzo l,4thiazine, 0,0-diethyl S-(ethylthio)- methyl phosphorodithioate, 2-chloro-Z-diethylcarbamoyl-lmethylvinyl dimethyl phosphate, Piperonyl butoxide, O-ethyl S,S-dipropyl phosphorodithioate, pyrethrins, 0,0-dimethyl- O-(2,4,5-trichlorophenyl) phosphorothioate, rotenone, 4-tbutyl-2-chlorophenyl O-methyl methylphosphoroamidate, ryanodine, sabadilla, (S-benzyl-S-furyl) methyl-2,2-dimethyl- 3-(2-methylpropenyl)-cyclopropanecarboxylate, octamethylpyrophosphoramide, sodium fluoride, 6(and 2)-chloro-3,4-xylylmethylcarbamate, polychlorinated (66% Cl) terpene, pchlorophenyl phenyl sulfone (mites), 0,0-dimethyl O-(4- nitro-m-tolyl)-phosphorothioate, 2-methyl-2-(methylthio) propionaladehyde O-(methylcarbamoyl) oxime, tetraethyl pyrophosphate, 4-chlorophenyl 2,4,5-trichlorophenyl sulfone isobornyl thiocyanaoacetate, chlorinated (67-69%) camphene, 0,0-dimethyl (2,2,2-trichlorol -hydroxyethyl) phosphonate and 0,0-diethyl-O-( 2-pyrozinyl) phosphorothioate.

Herbicides including 2-(ethylamino)-4-(isopropylamino)-6- (methylthio)-s-triazine,3-amino-2,S-dichlorobenzoic acid, 3- amino-I,2,4-triazole, ammonium sulfamate,2-triazine,2- chloro-4-ethylamino-6-isopropylamino-s-triazine, polychlorobicyclopentadiene, 4-chloro-2-butynyl-m-chlorocarbanitate, N-butyl-N-ethyl-a,a,a-trifluoro-2,-dinitro-p-toluidine, S- (0,0-diisopropyl -diisopropyl phosphorodithioate) ester of N- (Z-mercaptoethyl) benzenesulfonamide, methyl m-hydroxycarbanilate m-methyl carbanilate, 3,5-dibromo-4-hydroxybenzonitrile, S-ethyl diisobutylthiocarbamate, N,N-diallyl-2- chloroacetamide, 2-chloroallyl diethyldithiocarbamate, 3-[p- (p-chlorophenoxy)phenyl]-l,l-diemthylurea, isopropyl mchlorocarbanilate, calcium methanearsonate, pchlorophenoxy acetic acid, S-ethyl N-ethyl-N-cylcohexylthiocarbamate, 3,4-dichlorocyclopropanecarboxanilide, 2,4- dichlorophenoxy acetic acid and its salts, e.g., butylamine salt, and esters, e.g., isooctyl ester, 2,4,5-trichlorophenoxy acetic acid and its salts and esters, 2,2-dichloropropionic acid, 4- (2,4-dichlorophenoxybutyric acid its salts, amine salts and esters, dimethyl-2,3,5,6-tetrachlorophthalate, l,3-bis( lhydroxy-2,2,2-trichloroethyl) urea, tris[(2,4-dichlorophenoxy)ethyl] phosphite, S-2,3-dichloroallyl diisopropylthiocarbamate, 3,6-dichloro-o-anisic acid, 2,6-dichlorobenzo-nitrile, 2- (2,4-dichlorophenoxy) propionic acid, N,N-dimethyl-2,2- diphenylacetamide, diphenyl-acetonitrile, 3-( 3,4- dichlorophenyl l 1 -dimethylurea, 2-methyl-4,6-dinitrophenyl sodium salt, disodium methanearsonate, ethylene glycol bis(trichloroacetate), 7-oxabicyclo (2,2,1) heptane-2,3-dicarboxylic acid, -S-ethyl dipropylthiocarbamate, 2-(2,4,5- trichlorophenoxy) ethyl 2,2-dichloropropionate, diethyl dithiobis(thionoformate), 2,3,-trichlorophenylacetic acid or sodium salt, 3-phenyl-l,l-dimethylurea, 3-phenyl-l,ldimethylurea trichloroacetate, 1, l-dimethyl-3-(a,a,atrifluoro-m-tolyl) urea, 2-t-butylamino-4-ethylamino-6- methylthio-s-triazine, 3,5-diido-4-hydroxybenzonitrile, hexachloroacetone, -bromo-3-sec-butyl-6-methyluracil, potassium cyanate, 2-chloro-2', 6'-diethyl-N-(methoxymethyl) acetanilide, 3-cyclohexyl-6,7-dihydrol H-cyclopentapyramidine-2,4( 3H,5H)-dione,3-( 3,4-dichloropheny])-lmethoxyl -methylurea,3 4-bromo-3-chlorophenyl l methoxy-l-methylurea, mono ammonium methyl arsenate, 2- methyl-4-chlorophenoxyacetic acid and its salts and esters, 4- (2-methyl-4-chlorophenoxy) butyric acid and its salts and trichloroacetate,

esters, 2-(2-methyl-4-chlorophenoxy) propionic acid and its salts and esters, 1,2-dihydro 3,6-pyridazinedione, S-ethyl hexahydrol H-azepinel -carbothioate, 3-(p-chlorophenyl 1 ,1- dimethylurea, 3-(4-chlorophenyl)- l l -dimethylurea 2,4-bis [(3-methoxypropyl)-amino]-6- methylthio-s-triazine, monosodium acid methanearsonate, N- l-naphthylphthalamic acid, l-butyl-3-( 3 ,4-dichlorophenyl l methylurea, ethyl hydrogen l-propyl phosphonate, 4-(methylsulfonyl)-2,6-dinitro-N,N-dipropylaniline, 2,4-dichlorophenyl-p-nitrophenyl ether, 3-(hexahydro-4,7-methanoinden-5- yl)- l l-dimethylurea 1,1 -dimethyl-4,4'-bipyridinium dichloride or the corresponding bis (methyl sulfate), dimethylamine salt of polychlorobenzoic acid (PBA), pentachlorophenol, S-propyl butylethylthiocarbamate, 4-amino- 3,5,6-trichloropicotinic acid, 2,4'-dinitro-4-trifluoromethyldiphenyl ether, 2,4-bis(isopropylamino)-6-methoxy-s-triazine, 2,4-bis(isopropylamino)-6-(methylthio)-s-triazine, 2-chloro- N-isopropylacetanilide, 3,4-dichloropropionanilide, 2-chloro- 4,6-bis(isopropylamino)-s-triazine, isopropyl N-phenylcarbamate, 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone, sodium 2-(2,4-dichlorophenoxy)-ethyl sulfate, l-(2-methylcyclohexyl)-3-phenylurea, 2,(2,4,5-trichlorophenoxy) propionic acid and its salts and esters, 2-chloro-4,6- bis(ethylamino)-striazine, sodium arsenite, sodium chlorate, 3 -chloro-2-methyl-p-valerotoluidine, m-( 3 ,3-dimethylureido) phenyl t-butylcarbamate, dimethylamine salt of 2,3,6- trichlorobenzoic acid, 2,3,6 -trichlorobenzyloxypropanol, trichloroacetic acid, trichlorobenzyl chloride, 3-t-butyl-5- chloro-6-methyluracil, 2,6-di-t-butyl-p-tolylmethylcarbamate, S-2,3,3-trichloroallyl-diisopropyl thiocarbamate, 01,01,01- trifluoro-Z,6-dinitro-N,N-dipropyl-p-toluidine and S-propyl dipropylthiolcarbamate.

Nematocides including chloropicrin (trichloronitromethane), 0,0-diethyl O[p-(methylsulfinyl)phenyl] phosphorothioate, l,2-dibromo-3-chloropropane, D-D (mixture of l,3-dichloropropene, 3,3-dichloropropene,

l ,2-dichloropropane and 2,3-dichloropropene), l ,2- dibromoethane, O2,4-dichlorophenyl 0,0-diethyl phosphorothioate, 3-bromo-l-propyne and tetrachlorothiophene. Defoliants and desiccants such as arsenic acid, dimethyl arsinic acid, calcium cyanamide, S,S,S- tributyl phosphorotrithioate, 4,6-nitrophenol-O-sec. butylphenol,6,7-dihydrodipyrido [l,2a;-2 ',1 'c] pyrazinedium salts, S,S,S-tributyl phosphorotrithioite and magnesium chlorate; snail and lamprey controls, e.g., 2,5-dichlor0-4'- nitrosalicylanilide.

Enzymes such as leucylpeptidase, aminopolypeptidase, B,amylase, carboxypeptidase, pepsin, trypsin, luciferase, d-amino acid oxidase, phosphorylase, papain, catalase, ascorbic acid oxidase, malt diastase, rennin, pancreatin, a -amylase, pectinase, lipase, phosphatase, pectase, urease, arginase and glyoxalase.

Unless otherwise indicated, all parts and percentages are by weight.

EXAMPLE 1 Into a 30-gallon reactor was charged 40 lbs. of hydroxyethyl methacrylate, 4 lbs. of methacrylic acid, 120 lbs. of methanol and 0.05 lbs. of t-butyl peroctoate. The reactor was heated to C and allowed to stir 6 hrs to efi'ect polymerization, To the I polymer solution thus obtained was added 2.5 lbs. of sodium methoxide dissolved in 25 lbs. of methanol. The resulting solution was added slowly to a l0-fold excess of acetone to precipitate the polymer. After drying, a yield of 36 lbs. of water soluble polymer was obtained.

EXAMPLE 2 The polymer of Example 1 was dissolved in methanol to provide a 10 weight percent solution. To the solution was added orange oil at a level of 20 percent of the polymer content of the solution. The solution was then cast as a 20 mil film (wet) on a polyethylene sheet and dried. The resulting brittle film was ground to 60 mesh to yield a powder which exhibited only a slight odor of orange oil, but which released orange oil readily on contact with water.

EXAMPLE 3 The orange oil containing powder of Example 2 was blended with a commercial detergent (sodium dodecylbenzene sulfonate) at a level of percent of the detergent. When the detergent was added to hot water, the orange oil odor was immediately apparent.

EXAMPLE 4 Example 2 was repeated using citral in place of orange oil. A detergent composition prepared with citral containing polymer in accordance with Example 3, immediately gave off a citris like odor when added to hot water.

EXAMPLE 5 The citral-containing polymer of example 4 (without detergents) was pulverized to 325 mesh in a hammer mill. The micropulverized powder was milled with a saponified coconut oil soap base at a level of 1 lb. of powder to 9 lbs. of the soap. The soap was extruded and stamped into cakes. On use of the soap cake for hand washing, the citral odor was evident on the hands. This effect persisted through the life of the soap cake.

EXAMPLE 6 Example 1 was repeated with the exception that 1,180 g. of potassium hydroxide dissolved in 2 gallons of water was employed for neutralization.

EXAMPLE 7 Examples 2-5 were repeated using, however, the polymer of Example 6. Equivalent results were obtained.

EXAMPLE 8 Into a 30-gallon reactor was charged 40 lbs. of hydroxyethyl methacrylate, 1 lb. of methacrylic acid, 120 lbs. of methanol and 0.05 lbs. of t-butylperoctoate. The reactor was heated to 85 C and allowed to stir 5 hours to effect polymerization. The polymer was isolated by precipitation from the alcohol solution with water, and allowed to dry. A yield of 37 lbs. was obtained. The polymer was re-dissolved in methanol to provide a weight percent solution. To the solution was added 1 liter of 10 percent ammonium hydroxide, and the solution was spray-dried to provide a water soluble powder suitable for entrapment of flavors, fragrances, drugs, pesticides, etc., of the types set forth above, e.g., using 10 percent of additive with the copolymer.

EXAMPLE 9 Strong coffee was brewed by slurrying g. of ground coffee in 75 cc. of water and heating to the boiling point. The coffee solution was filtered from the grounds, and 2 g. of the polymer of example 8 was dissolved in the solution. The solution was then evaporated to dryness in a rotary vacuum apparatus to yield a brittle film which was finely ground. On addition of the powder to boiling water, a beverage was obtained which more nearly retained the flavor of fresh percolated coffee than the usual commercial instant coffee.

EXAMPLE 10 into a 30-gallon reactor was charged 40 lbs. of hydroxyethyl methacrylate, 3 lbs. of dimethylaminoethyl methacrylate, 120 lbs. of methanol and 0.05 lbs. of diisopropyl percarbonate. The reactor was heated to 75 C and was stirred 7 hours to effect polymerization. The polymer was isolated by precipitation with water, and dried. A yield of 35 lbs. was obtained. 10 grams of the polymer was dissolved in 90 g. of 0.1 N HCl and the pH was adjusted to 4.5 with dilute sodium hydroxide. To the solution was added 3.5 g. of a mixture of lipolytic and protease enzymes, and the solution was dried at 25 C in vacuo to provide a film having the enzymes trapped therein.

The film was ground and dry dispersed in an amount of 10 percent in a commercial detergent composition, specifically Fab, a mixture of 14 to 18 carbon atom alkyl alcohols, 10-18 carbon atom linear alkane sulfonates, potassium xylene sulfonate and tetra potassium pyrophosphate.

On aging it was noted that enzyme activity was maintained at a high level when the detergent containing the entrapped enzymes was added to water. Thus, entrapping the enzymes in the polymer film serves to protect them from degradation during storage by the alkalinity of the detergent composition.

EXAMPLE 11 Example 2 was repeated replacing the orange oil by artificial strawberry flavor. 10 parts of the strawberry flavor containing powder was blended with 10 parts of sugar, 3 parts of citric acid and 4 parts of sodium bicarbonate to produce a powder which when added to water dissolved to form a sparkling clear, carbonated strawberry flavored beverage.

EXAMPLE 12 The procedure of Example 11 was repeated replacing the strawberry flavor by (a) an equal weight of lemon-lime flavor to produce a lemon-lime beverage and (b) by an equal weight of synthetic cherry flavor to produce a cherry flavor.

EXAMPLE l3 The procedure of Example 2 was repeated replacing the orange oil by an equal weight of vanillin. The resulting vanillin flavored powder was used in the preparation of dry cake mixes.

EXAMPLE 14 The procedure of Example 2 was repeated using an equal weight of biacetyl in place of the orange oil to produce a powder providing flavor enhancement when used in dry cake mixes and in oleomargan'ne.

EXAMPLE 15 The polymer of Example 8 was dissolved in methanol to form a 7 weight percent solution. The solution was divided into 3 portions. To portion No. l was added a pine fragrance at a level of 10 percent of the polymer content. To portion No. 2 at the same level there was added a new mown hay fragrance and to portion No. 3 a lilac fragrance was added at the same level. The three solutions were then spray dried to provide powders containing the respective fragrances. These powders were suitable for incorporation into soap cakes in the manner described in example 5 and at a level of 1 pound of entrapped fragrance powder to 10 pounds of soap powder. Soap thus treated when extruded and stamped into cakes retained the fragrance for the life of the soap.

EXAMPLE 16 The polymer of Example 1 was dissolved in ethanol to provide a 10 weight percent solution. The solution was divided into four 1,000 gram portions and 20 grams of an enzyme preparation added to each. The enzyme preparations used were (a) Rhozyme-S (Rohm & Haas) a diastatic enzyme; (b) Rhozyme 33 which is a -amylase; (c) Lipase B, a lipolytic enzyme; and (d) Rectinol S9L, a peptic enzyme.

Each of the four solutions was evaporated to dryness and ground to provide entrapped enzymes suitable for compounding into commercial detergent preparations based on nonionic and/or anionic detergent materials.

EXAMPLE 17 l The polymer of Example 1 l was dissolved in a 50:50 methanol/water mixture to provide a solution containing 15 percent solids. In g. of the solution was dissolved 5 g. of sodium acetyl salicylate (aspirin). The solution was dried as a thin film on a rotating evaporator and the dried film was granulated. The powder was pelletized into 250 mg. tablets with a tableting press. The tablets, containing 62.5 mg. of aspirin swelled, but did not dissolve in 0.1 N HCl solution, but were soluble at a pH above 5.5 such as is encountered in the intestinal tract.

1 EXAMPLE 18 Example 17 was repeated using the polymer of example 10. The resulting tablets containing aspirin were soluble in the acidic environment of the stomach, but only swelled slightly in water at a pH above 5.5.

EXAMPLE 19 Example 17 was repeated using amobarbitol sodium i place of aspirin. Equivalent results were obtained.

' EXAMPLE 20 Example 17 was repeated using prednisone, an anti-inflammatory agent. Equivalent results were obtained.

EXAMPLE 21 The polymer of Example 1 was dissolved in ethanol to provide a solution containing 15 percent solids. In 100 grams of the solution were dissolved 3 grams of penicillin and the solution dried as a thin film and treated as in example 20 to produce tablets containing the penicillin and polymer.

EXAMPLE'22 The polymer of example was dissolved in ethanol to provide a solution containing 10 percent solids. In 100 grams of the solution was dissolved 1 gram of 2,4-dichlorphenoxy acetic acid and the solution dried as a thin film and granulated. The granulated powder was suitable as a source of the herbicide.

EXAMPLE 23 The polymer of example 10 was dissolved in ethanol to provide a solution containing percent solids. In 100 grams of the solution was dissolved 4 grams of parathion and the solution dried as a film and granulated. The granulated powder was suitable for use in applying parathion to plants and to the soil.

EXAMPLE 24 The procedure of example 23 was repeated replacing the parathion by phenyl mercuric acetate to provide a fungicidal dry powder.

The water soluble polymers are also useful to entrap vitamins. Thus, there can be entrapped thiamine, riboflavin, nicotinamide, pantothenic acid, pyridoxine, biotin, inositiol, p-aminobanzoic acid, cyanocobalamin, ascorbic acid, vitamin K K IQ and K alcohol soluble vitamins such as Vitamin A, Vitamins D,, D and D and Vitamin E.

EXAMPLE 25 To 100 grams of a 10 percent solution of the polymer prepared in example 10 in water there was added 2 grams of riboflavin phosphate. The solution was dried as a film and granulated. The product was readily soluble in water and provided a source of Vitamin B In place of riboflavin in this example there can also be used the same amount of ascorbic acid or nicotinamide to provide a stable water soluble source thereof.

As used in the claims the term drugs is intended to include vitamins.

The materials entrapped in the water soluble hydroxyalkyl, acrylate or methacrylate polymer can be either solids or liquids and numerous examples of both solids and liquids are set forth supra.

As used in the claims the term detergent is intended to include soaps.

What is claimed is:

l. A powdered, dry composition consisting essentially of a solid, hydrophilic, water soluble copolymer of a member of the group consisting of hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate with 0.5 percent up to 20 percent of a water solubilizing copolymerizable monomer selected from the group consisting of l) alkali metal and ammonium salts of a polymerizable organic acid and (2) strong acid salts of polymerizable organic amines, said water solubilizing monomer units being present in the copolymer in sufficient amounts to render the copolymer completely soluble in water, having entrapped therein at least 0.1 percent based on the weight of the polymer of a solid or liquid pesticide, said composition being adapted to release the entrapped pesticide upon contact with water by virtue of the dissolution of the water soluble polymer in water, said polymer composition protecting the entrapped pesticide from atmospheric oxygen and preventing diffusion and loss thereof, said composition being formed from a substantially anhydrous casting syrup of the entrapped pesticide and the monomers and polymerizing the composition.

2. A composition according to claim 1 wherein said copolymerizable monomer is ethylenically unsaturated.

3. A composition according to claim 2 wherein the acrylate or methacrylate is hydroxyethyl methacrylate and said copolymerizable monomer is the salt of a polymerizable organic acid.

4. A composition according to claim 2 wherein the acrylate or methacrylate is hydroxyethyl methacrylate and said copolymerizable monomer is a salt of an organic amine.

5. A composition according to claim 2 wherein the pesticide is a herbicide.

6. A composition according to claim 2 wherein the pesticide is a bactericide. I

7. A composition according to claim 2 wherein the pesticide is a fungicide.

8. A composition according to claim 2 wherein the pesticide is an insecticide.

9. A composition according to claim 2 wherein the pesticide is a bactericide, fungicide or insecticide. 

2. A composition according to claim 1 wherein said copolymerizable monomer is ethylenically unsaturated.
 3. A composition according to claim 2 wherein the acrylate or methacrylate is hydroxyethyl methacrylate and said copolymerizable monomer is the salt of a polymerizable organic acid.
 4. A composition according to claim 2 wherein the acrylate or methacrylate is hydroxyethyl methacrylate and said copolymerizable monomer is a salt of an organic amine.
 5. A composition according to claim 2 wherein the pesticide is a herbicide.
 6. A composition according to claim 2 wherein the pesticide is a bactericide.
 7. A composition according to claim 2 wherein the pesticide is a fungicide.
 8. A composition according to claim 2 wherein the pesticide is an insecticide.
 9. A composition according to claim 2 wherein the pesticide is a bactericide, fungicide or insecticide. 